Instructor Guide. 215: Elevator: Mechanical Drive Systems Module 3: Gearless Drive Systems
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1 PR EV IE W O N LY Instructor Guide 215: Elevator: Mechanical Drive Systems Module 3: Gearless Drive Systems
2 Table of Contents Overview Gearless Drive Operation...8 Geared Vs. Gearless. 22 Summary..29 1
3 Icons Used In This Guide Agenda Topic # Topic Title Duration 1 Overview 30 minutes Gearless Operation Field Trip Geared vs. Gearless Field Trip Summary Total Time: 40 minutes 60 minutes 40 minutes 60 minutes 30 minutes 260 minutes 2
4 Overview Purpose The purpose of this module is to: Provide the participant with an overview of gearless drive systems for elevators in use in a public transit environment Objectives At the end of this lesson, the transit elevator/escalator trainee will be able to: Explain how a gearless drive system operates Identify major components of the gearless drive systems List methods of controlling gearless drive systems Identify the speed specifications of a gearless drive system Explain difference between geared and gearless drive systems Materials Mandatory Make sure you have the following Optional PowerPoint Presentation Coursebook Quizzes Pencils Brochure: Modernization Solutions ThyssenKrupp Elevator s Geared to Gearless You may also want the following for optional activities: Chalk board with chalk, large paper with marker, etc. Internet connection Lab, simulator or out of service elevator 3
5 Module Length: 260 min Time remaining: 260 min This section: 30 min (5 slides) Section start time: Section End Time: REVIEW introduction slides Welcome to the course on Elevator Mechanical Gearless Drive Systems. Electric traction elevators can be either geared or gearless. In the previous module, the participant learned that in geared elevators the motor turns a gear train that rotates the sheave. In gearless elevators, the motor rotates the sheaves directly. Geared elevators cost less but they cannot travel as fast as gearless elevators which can travel as fast as 1,200 fpm. In this module the participant will explore how a gearless drive system operates as well as explore further differences between geared and gearless drive systems. PPT slides 1, 2 4
6 Module Length: 260 min Time remaining: 260 min This section: 30 min (5 slides) Section start time: Section End Time: REVIEW key terms Lets take a look at some of the key words we will be defining as move through this module: Armature Armature shaft Brake drum Brushes Commutator Field windings As well as Gearless drive Magnetic field Regenerative drives Rotor Stator PPT slide 4 6
7 Module Length: 260 min Time remaining: 230 min This section: 40 min (17 slides) Section start time: Section End Time: REVIEW slide Gearless drive systems work in the same way PPT slide 7 as geared drive systems except that the drive sheave is directly attached to the end of a motor and gears are not used to transfer power from motor to drive sheave. The hoist ropes are attached to the top of the elevator and wrapped around the drive sheave while the other ends of the ropes are attached to a counterweight that moves up and down in the hoistway on its own guiderails. The combined weight of the elevator car and the counterweight presses the ropes into the drive sheave grooves, providing the necessary traction as the sheave turns. 9
8 Module Length: 260 min Time remaining: 230 min This section: 40 min (17 slides) Section start time: Section End Time: REVIEW slides Inside of the motor are the two principal PPT slides 10, 11 electrical components of an electromechanical machine: the armature and field windings. coil. The armature is the rotating part and is also known as the rotor. The photo you see here is an example of a motor. 11
9 Module Length: 260 min Time remaining: 230 min This section: 40 min (17 slides) Section start time: Section End Time: REVIEW slides The stator is the stationary part of an electric motor and its role is to create a magnetic field or magnetic flux for the armature to interact with and thereby rotate. The stator can comprise either permanent magnets, or electromagnets formed by a conducting coil. Field and armature wiring in elevator motors is typically comprised of copper because copper has a high electrical conductivity. PPT slides 12, 13 12
10 Module Length: 260 min Time remaining: 230 min This section: 40 min (17 slides) Section start time: Section End Time: REVIEW slide Gearless traction elevators often use regenerative drives which are designed to capture energy normally dissipated from the motor and re-route this energy back into the structure s electrical grid essentially allowing the elevator motor to act as a generator. In a typical traction system, whenever the elevator slows down, energy is created and dissipated as heat by means of a heat resistor. This heat can be captured and regenerated by the use of regenerative drives. Regenerative drives thereby offer significant savings to energy costs as well as reducing environmental waste. However, regeneration technology is expensive and can add significant initial costs to an elevator. PPT slide 17 15
11 Electric Traction Principles of Operation Module Length: 260 min Time remaining: 230 min This section: 40 min (17 slides) Section start time: Section End Time: REVIEW slide REFER participants to Modernization Solutions ThyssenKrupp Elevator s Geared to Gearless Modernization Solutions ThyssenKrupp Elevator s Geared to Gearless is a great brochure which accompanies this module. With permission from ThyssenKrupp Elevator to use, lets take a look. [Refer participants to brochure Modernization Solutions ThyssenKrupp Elevator s Geared to Gearless to review additional information on gearless traction machines.] PPT slide 18 Modernization Solutions ThyssenKrupp Elevator s Geared to Gearless 16
12 Module Length: 260 min Time remaining: 230 min This section: 40 min (17 slides) Section start time: Section End Time: ASK The principle components in gearless drive systems include (check all that apply) a. Armature b. Stator c. Brake drum d. Worm gear e. Traction sheave Call on participants for answers. for the correct answers. Answer: a., b., c., and e.. PPT slide 20 18
13 Module Length: 260 min Time remaining: 230 min This section: 40 min (17 slides) Section start time: Section End Time: ASK The is the stationary part of an electric motor and its role is to create a magnetic field for the to interact and thereby rotate. a. stator, armature b. Armature, stator Call on participants for answers. for the correct answers. Answer: a.. PPT slide 21 19
14 Module Length: 260 min Time remaining: 230 min This section: 40 min (17 slides) Section start time: Section End Time: ASK Describe advantages and disadvantages of a PPT slide 22 regenerative drive. Call on participants for answers. for the correct answers. Answer: Heat is captured and regenerated saving energy and environment waste, however this technology is expensive.. 20
15 Module Length: 260 min Time remaining: 190 min This section: 60 min Section start time: Section End Time: ASK CLASSROOM ACTIVITY [At instructor s discretion, take time to visit the field and look for examples gearless drive operation and components,] PPT slide 23 21
16 Module Length: 260 min Time remaining: 30 min This section: 30 min (3 slides) Section start time: Section End Time: CLASSROOM ACTIVITY INDIVIDUAL ACTIVITY Administer quizzes. PPT slides 36 Quizzes Pencils 30
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